Improvement in screw-plates



N. ZILLIER.

Screw Plate.

Patented July '24, 1866.

7 71768866 igjk zp N PETERS, Phoeo-Lnho n lm. Washingfun. D. C.

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UNITED STATES PATENT. OFFICE.

NICHOLAS ZILLIER, OF NEW CASTLE, DELAWARE.

IM PROVEMENT IN SCREW-PLATES.

- Specification forming part of Letters Patent No. 56,663, dated July24, 1866.

i To all whom it may concern.-

Be it known that I, NIoHoLAs ZILLIER, of New Castle, in the county ofNew Castle and State of Delaware, have invented a new and usefulImprovement in Screw-Plates; and -I do hereby declare that the followingis a full, clear, and exact description thereof, which will enableothers skilled in the art to make and use the same, reference being hadto the accompanying drawings, forming part of this specification, inwhich- Figure 1 is a side view of my improved screw-plate. Fig. 2 is adetail view of the same, taken through the line a; m, Fig. 3. Fig. 3 isa longitudinal section of the same, taken through the line 3 y, Fig. 1.

Similar letters of reference indicate like parts.

My invention has for its object to furnish an improved screw-plate forcuttin g the threads upon screws, simple in construction, and easilyadjusted so as to cut the threads upon screws of any desired sizewithout changing the dies; and it consists of a screw-plate formed bycombining with the two-handled plate a die-holder, dies, spring, andcap, the whole being constructed and arranged as hereinafter more fullydescribed;

A is the plate, which is made with two handles, a and M, as shown inFig. 1. Through the center of this plate is formed a hole. This hole iscut out in the shape represented in Fig. 2that is to say, in theinterior edge of the plate A, forming the sides of the hole, are formedthree shoulders, ((9, the said edge curving gradually from the top ofone shoulder to the bottom of the next one, forming three circularinclined planes, a, as shown in Fig. 2.

B is the die-holder, which is a plate of such a size as to cover thehole through the plate A, and has a circular projection, b, on its innerside, of such a size as to fit into the hole through the plate A betweenthe shoulders a as shown in Fig. 2. This die-holder B has a circularhole through its center, through which the screw upon which the threadis to be cut enters, and into which the cutting-dies project.

The height of the projection b is equal to the thickness of the plate A,so that the face of said projection may be flush with the side of thesaid plate A, as shown in Fig. 3.

The outer edge of the face of the projection b is channeled, so as toform a circular shoulder for the reception of the spring 0. The surfaceof the projection is also grooved radially planes a.

for the reception of the three cutting-dies D. The grooves are of adepth equal to the height of the projection b, so that the breadth ofthe dies D may equal the thickness of the plate A.

The rear ends of the dies D are beveled t correspond to the inclinationof the inclined The upper edges of said dies are also notched for thereception of the open spring-ring O.

E is a cap of sufficient size to cover the hole through the plate A. Thecap is secured to the die-holder B by screws F, which screw into theprojection b, as shown in the drawings, holding the dies D and springGsecurely in place, as shown in Fig. 3.

Upon one edge of the die-holder B and of the cap E are formed ears G andH, in which are. formed circular slots, as shown in Figs. 1 and 3. Inthe plate Ais also formed a shorter circular slot, as shown in Fig. 2.

I'is a bolt passing through the three slots, the body of which is soformed that it cannot The dies are adjusted for cutting screws ofdifferent sizes by revolving the die-holder B and cap E in one or theother direction. By revolving these parts in one direction the dies Dare forced forward by their rear ends pressing against the inclinedplanes to, enabling the tool to cut the threads upon a small screw. Byrevolving them in the other direction the dies are drawn inward by theaction of the spring 0, enabling the tool to cut the threads upon alarge screw, the index K and scale L enabling the dies to be so set asto cut the screw of the exact size required.

I claim as new and desire to secure by Letters Patent- An improvedscrew-plate formed by combining with the two-handled plate A thedieholder B, the dies D, the spring 0, and the cap E, the parts beingconstructed and arranged substantially as herein described, and for thepurpose set forth.

Witnesses: v NICHOLAS ZILLIER.

JNo. MERRITT, PETER B. VANDEVER.

